package com.hs.netty.chapter04;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

/**
 * @Author: songhao
 * @Date: 2021/8/24
 * @Description: TODO
 */
public class SimpleChatServerHandler extends SimpleChannelInboundHandler<String> {

    public static ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        Channel incoming = ctx.channel();
        for(Channel channel : channels){
            channel.writeAndFlush("[SERVER] - " + incoming.remoteAddress() + "加入\n" );
        }
        channels.add(ctx.channel());
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        Channel incoming = ctx.channel();
        for(Channel channel : channels){
            channel.writeAndFlush("[SERVER] - " + incoming.remoteAddress() + "离开\n" );
        }
        channels.remove(ctx.channel());
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx,
                                String s) throws Exception {
        Channel incoming = ctx.channel();
        for(Channel channel : channels){
            if(channel != incoming){
                channel.writeAndFlush("[" + incoming.remoteAddress() + "]" + s + "\n");
            }else{
                channel.writeAndFlush("[you]" + s + "\n");
            }
        }
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        Channel incoming = ctx.channel();
        System.out.println("SimpleChatClient:" + incoming.remoteAddress() + "在线");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        Channel incoming = ctx.channel();
        System.out.println("SimpleChatClient:" + incoming.remoteAddress() + "掉线");
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        Channel incoming = ctx.channel();
        System.out.println("SimpleChatClient:" + incoming.remoteAddress() + "异常");
        //当出现异常就关闭连接
        cause.printStackTrace();
        ctx.close();
    }
}
